package com.example.tests;


import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;


import com.thoughtworks.xstream.XStream;




public class GroupDataGenerator {


        public static void main(String[] args) throws IOException {
                if (args.length < 3) {
                        System.out.println("Please specify parametres: <amout of test data> <file> <format>");
                        return;
                }
                
        int amount = Integer.parseInt(args[0]);
        File file = new File(args[1]);
        String format = args[2];
        
        if (file.exists()) {
                System.out.println("File exists, please remove it manually: " + file); 
        }
                
        List<GroupData> groups = generateRandomGroups(amount);
        if ("csv".equals(format)) {
                saveGroupsToCsvFile (groups, file);
        } else if ("xml".equals(format)) {
                saveGroupsToXmlFile (groups, file);
        } else {
                System.out.println("Unknown format" + format);
        }
        }
        


        private static void saveGroupsToXmlFile(List<GroupData> groups, File file) throws IOException {
                XStream xstream = new XStream();
                xstream.alias("group", GroupData.class);
                String xml = xstream.toXML(groups);
                FileWriter writer = new FileWriter(file);
                writer.write(xml);
                writer.close();
        }


        public static List<GroupData>loadGroupsFromXmlFile(File file) {
                XStream xstream = new XStream();
                xstream.alias("group", GroupData.class);
                return (List<GroupData>) xstream.fromXML(file);
                }


        private static void saveGroupsToCsvFile(List<GroupData> groups, File file) throws IOException {
                FileWriter writer = new FileWriter(file);
                for (GroupData group : groups) {
                        writer.write(group.getName() + "," + group.getHeader() + "," + group.getFooter() + ",!" + "\n");
                }
                writer.close();
                }
        
        public static List<GroupData> loadGroupsFromCsvFile(File file) throws IOException {
                List<GroupData> list = new ArrayList<GroupData>();
                FileReader reader = new FileReader(file);
                BufferedReader bufferedReader= new BufferedReader(reader);
                String line = bufferedReader.readLine();
                while (line != null) {
                        String[] part = line.split(",");
                        GroupData group = new GroupData()
                        .withName(part[0])
                        .withHeader(part[1])
                        .withFooter(part[2]);
                        list.add(group);
                        line = bufferedReader.readLine();
                        }
                bufferedReader.close();
                return list;
        }


        public static List<GroupData> generateRandomGroups(int amount) {
                List<GroupData> list = new ArrayList<GroupData>();
                for (int i = 0; i < amount; i++) {
                        GroupData group = new GroupData()
                        .withName(generateRandomString())
                        .withHeader(generateRandomString())
                        .withFooter(generateRandomString());
                        list.add(group);
                }
                return list;
        }
        
        public static String generateRandomString() {
                Random rnd = new Random();
                        if (rnd.nextInt(3) == 0) {
                                return "";
                        } else { 
                                return "test" +rnd.nextInt();
                        }
        }
}